Use the up and down arrows to turn the biplane. Crash into the clouds to earn points. As soon as you reach the edge of the right side, you will be teleported back. It is slow at first, but it gets progressively faster. Tell your scores in the comments below!
I used a guidebook to code this so... There was a glitch though. The starting position made it so that as soon as you click the green flag, you lose the game. I tweaked it so you start a little bit above, so you're welcome. ;)